CONTRIBUTIONS TO OUR KNOWLEDGE OF CERATODUS. 
Parr I.—Tue Buioop VEssELs. 
By W. Barpwin Spencer, M.A., Proressor or Brotocy ry tHe University or 
MELBOURNE. 
(Plates 1.-v.) 
CONTENTS. 
PAGE 
J.—IntroDUCTORY ses nag 006 600 20 bane 400 560 eee 
IT.— ARTERIES 4 
A. Ventral aorta and afferent branchial arteries 4 
B. Efferent branchial arteries, epibranchial arteries, and dorsal aorta 5 
C. Branches arising from the efferent and epibranchial arteries 7 
D. Vessels arising from the dorsal aorta 11 
(a) Left side 11 
(8) Right side 12 
IIJ.—Putmonary SysTEM 14 
A. Lung... 15 
B. Pulmonary arteries ... 15 
C. Pulmonary vein We 
IV .— VEINS wh ee are Soc ie as Se ae a eee WI 
A. Caudal vein ... nae age Sosa iste zee sae aoc aoa alts) 
B. Renal portal system ods nie por 308 50r 300 sco lf 
(1) Posterior trunk veins Hen 000 ban an iss Pasnew 
(2) Intercostal veins... dct noe ane He spe sca NY 
(3) Renal portal vein... as 608 660 Scie sits aos, walt) 
C. Anterior abdominal system... 20% née ae bad a0c ae 20 
D. Hepatic portal system and hepatic veins ... ped 500 a son AD) 
E. Derivatives of the anterior cardinal system 21 
(1) Superior jugular vein ase yee ae ne ae oat Oe 
(2) Inferior jugular vein 23 
F. Derivatives of the posterior cardinal system 24 
(1) Posterior cardinal of the left side ... 24 
(2) Inferior vena cava ... 25 
(3) Vertebral veins 25 
G. Brachial veins eae se 580 te 666 are onc wae 26 
H. Cutaneous vein system bc 208 368 cB 56 so wa 26 
V.—GENERAL CONSIDERATIONS ... 20 500 ee ia 408 500 ee 
VI.—DEscripPTION OF PLATES ... Bee si aa rae a ee seen Oe 
A 
